keepavlied起初专门为LVS设计的，专门用来监控LVS集群系统中各个服务节点的状态，后来加入VRRP功能，因此除了配合LVS服务外，也可以作为其他服务（nginx，haproxy）的高可用软件。
keepalived服务两大用途：healthcheck 健康检查（针对RS） 、failover 高可用故障转移（主备）
keepalived的安装，主和备都需要安装
和LVS安装一样，最好也先给内核路径做一个软连接到/usr/src/linux
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[root@localhost ~]
# ln -s /usr/src/kernels/2.6.32-573.8.1.el6.i686/ /usr/src/linux
[root@localhost ~]
# cd /usr/local/src/
[root@localhost src]
# wget [root@localhost src]# tar xf keepalived-1.1.19.tar.gz
[root@localhost src]
# cd keepalived-1.1.19
[root@localhost keepalived-1.1.19]
# ./configure
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configure执行成功的结果：有3个Yes；支持IPVS框架，IPVS的同步支持，VRRP的框架支持；
Keepalived configuration
------------------------
Keepalived version : 1.1.19
Compiler : gcc
Compiler flags : -g -O2
Extra Lib : -lpopt -lssl -lcrypto
Use IPVS Framework : Yes
IPVS sync daemon support : Yes
Use VRRP Framework : Yes
Use Debug flags : No
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[root@localhost keepalived-1.1.19]
# make
[root@localhost keepalived-1.1.19]
# make install
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配置keepalived
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[root@localhost keepalived-1.1.19]
# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/
[root@localhost keepalived-1.1.19]
# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[root@localhost keepalived-1.1.19]
# mkdir /etc/keepalived -p
[root@localhost keepalived-1.1.19]
# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
[root@localhost keepalived-1.1.19]
# cp /usr/local/sbin/keepalived /usr/sbin/
[root@localhost keepalived-1.1.19]
# /etc/init.d/keepalived start
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主MASTER、备backup上配置文件：/etc/keepalived/keepalived.conf
主master配置：
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vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.20.100
/24
}
}
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备 backup 的配置:
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vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.20.100
/24
}
}
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主、备启动keepalived，主绑定VIP地址，主停止keepalived服务，备机马上接管VIP；
本文转自 模范生 51CTO博客，原文链接：http://blog.51cto.com/mofansheng/1715866，如需转载请自行联系原作者
